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Photo of Johan Bijnens

Johan Bijnens

Professor

Photo of Johan Bijnens

The vector and scalar form factors of the pion to two loops

Author

  • Johan Bijnens
  • Gilberto Colangelo
  • Pere Talavera

Summary, in English

We calculate the vector and scalar form factors of the pion to two loops in Chiral Perturbation Theory. We estimate the unknown O(p6) constants using resonance exchange. We make a careful comparison to the available data and determine two O(p4) constants rather precisely, and two O(p6) constants less precisely. We also use Chiral Perturbation Theory to two loops to extract in a model-independent manner the charge radius of the pion from the available data, and obtain 〈r2vπ = 0.437 ± 0.016 fm2.

Department/s

  • Department of Astronomy and Theoretical Physics

Publishing year

1998-12-01

Language

English

Publication/Series

Journal of High Energy Physics

Volume

1998

Issue

JHEP05(1998)

Document type

Journal article

Publisher

Springer

Topic

  • Other Physics Topics

Keywords

  • Chiral lagrangians
  • Spontaneous symmetry breaking

Status

Published

ISBN/ISSN/Other

  • ISSN: 1029-8479